eeee eefe eero eeze efeo efor efze eore epee eper epor eppo eppp epro eprp erer erez eroe eroo erpe erre erro erur euer eur- eure euro ezer ezop ezuz ezzo feer fefe feff fefo feof fere fero ferr feru ferz ffee ffff ffrr foer fofo foof fopp for- fore foro forr foup four fprf free freo frep froe frop frou frue fruz fuff fufu fuor fur- fure furo furr fuze fuzz o-eo oere oeuf ofer off- offe offo offr offu ofor ofoz ofre ofuz ooer ooff oooo oore ooze opep oper opo- opor oppo ore- oreo orer orfe orff orfu oro- oroe orof oror oroz orpe orro orup orzo orzu ouer oufe ouff oupe our- oure ouro ouu- ouze ouzo ozee ozer peep peer peff peor peou pepe pepo per- pere perf pero perp perr peru peur peze pezo pfff pffr poer poff poof poop poor pop- pope popo popp pore poro porr porz pouf poup pour poze pozo pper pppo pppp pprf ppru ppur pre- pree pref prep preu prez pro- proe prof proo prop prou proz prue pruf pruu pu-e pueo puer pueu puff pupe pupu pur- pure puro purp purr puru puzo reef reep refe reff refr refu reof reop reou repe repo repp repr repu rere rero reru reue reuf reup reuu reze rezu rfef roer rofe roff rofo roof roop roor rooz rope ropo rore roro roru roue rouf roup rouz roze rozz rpoe rpof rrrr ruer ruez rufe ruff rufo rupe rupp rure ruro rurp ruru ruze u-rp ufer uffe uofo uor- uore upor uppe uppp uppu upup ure- urfe urff uro- uroo urpo urre urup urur uruz uuuu uzer z-ro zeep zeff zepo zepp zerf zero zeze zoff zoo- zoop zope zopf zore zoro zozo zozu zpuf zrze zuoz zurf zurr zuru zuzu zzzz